[BULK] - [Amps] ganging 2 switching power supplies in paralle l

[Steve Katz]

> Hello,
> 
> I need to gang two switching power in parallel to double current 
> capacity. What is a good voltage drop to target for the balancing 
> resistors??
> 
> //You wouldn't want to use resistors, at all, unless your current demand
> is very low.  Even 0.1 Ohms at 20A provides 2V drop -- way too much for
> most any amateur application.  Better to use low-drop power rectifiers
> (Schottky barrier high-current rectifiers with Vf drop of ~0.3V @
> 20-30-40A are readily available) or low-Rds power FETs (which can have
> forward drop of <0.1V at 20-30A).  These will act as a power OR-gate and
> protect both supplies while providing reasonable current sharing if the
> supplies are carefully adjusted for identical output voltage. -WB2WIK/6
> 
> 
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